Electro-hydraulic servo pressure testing machine

Abstract

The invention discloses an electro-hydraulic servo pressure testing machine, and relates to the technical field of pressure testing machines. The electro-hydraulic servo pressure testing machine comprises a base and a supporting frame, a stand column is fixedly connected to the upper surface of the base, an oil cylinder is fixedly connected to the middle of the upper surface of the base, an upper pressing disc is fixedly connected to the bottom of a transmission assembly, and a feeding device and a protection device are fixedly connected to the outer surface of the supporting frame. An adjusting device is fixedly connected to the side of the upper surface of the supporting frame, a first sliding groove is formed in the upper surface of the supporting frame, a lower pressing disc is arranged under the upper pressing disc, the feeding device comprises a base, a folding supporting frame, a first air cylinder, an upper supporting table, a rotating shaft and a pushing mechanism, and the protection device comprises a protection sleeve shell, an opening and closing door, an observation window, a cleaning mechanism and a buffering mechanism. The automation degree of the pressure testing machine is improved, the workload and the labor intensity of workers can be further reduced, the pressure testing machine is suitable for carrying out a pressure test on a large to-be-tested piece, and the practicability of the equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pressure testing machines, in particular to an electro-hydraulic servo pressure testing machine. Background Art

[0002] Pressure testing machine is a commonly used test equipment, which is used to determine the compressive performance of material components and their stability and durability under working conditions. It can simulate the pressure load under various working conditions, and evaluate its performance under real working environment by applying continuous or instantaneous pressure to materials or components. Electro-hydraulic pressure testing machine is mainly used for compression test of various materials, such as compressive strength test of cement, concrete, various building bricks, rubber pads, concrete components, metal components, etc. The whole machine is mainly composed of four parts: main machine, oil source, control cabinet and digital display. The machine uses hydraulic system to apply test force, and the test data is measured by oil pressure sensor and displayed by digital tube. It has functions such as peak hold and loading speed display. The operation and display parts are of appropriate height, which is convenient for the tester to operate and observe. When the existing electro-hydraulic servo pressure testing machine tests heavier materials such as concrete blocks, it is usually necessary to manually carry the test piece to the workbench, which is not only laborious, but also requires manual adjustment when the test piece is not placed in the appropriate position on the workbench, which is inconvenient and has low work efficiency. Summary of the invention

[0003] In view of the deficiencies of the existing problems, the present invention provides an electro-hydraulic servo pressure testing machine to solve the existing problems raised in the above background technology.

[0004] To solve the above problems, the present invention is implemented through the following technical solutions: an electro-hydraulic servo pressure testing machine, comprising a base and a support frame, the upper surface of the base is fixedly connected to a column, the middle of the upper surface of the base is fixedly connected to an oil cylinder, the top of the column is fixedly connected to a crossbeam, the outer surface of the column is provided with a transmission assembly, the bottom of the transmission assembly is fixedly connected to an upper pressure plate, the inside of the support frame is fixedly connected to the outer surface of the column, the outer surface of the support frame is fixedly connected to a feeding device and a protective device, the side of the upper surface of the support frame is fixedly connected to an adjusting device, the upper surface of the support frame is provided with a first slide groove, a lower pressure plate is provided directly below the upper pressure plate, and the bottom of the lower pressure plate is fixedly connected to A workbench, the outer surface of the workbench is fixedly connected to a connecting plate, the top of the inner surface of the connecting plate is fixedly connected to a driving motor, the interior of the connecting plate is provided with a worm, the output shaft of the driving motor is fixedly connected to a worm wheel, the outer surface of the worm wheel is meshed with the outer surface of the worm, both ends of the worm are fixedly connected to driving wheels, and the sides of the bottom of the workbench are rotatably connected to driven wheels, the outer surfaces of the driving wheel and the driven wheel are extruded and adapted to the inner surface of the first slide groove, the feeding device comprises a base, a folding support frame, a first cylinder, an upper support platform, a rotating shaft and a pushing mechanism, the protective device comprises a protective cover shell, an opening and closing door, an observation window, a cleaning mechanism and a buffer mechanism, and the adjusting device is symmetrically arranged on the upper surface of the support frame.

[0005] Preferably, the outer surface of the base is fixedly connected to the outer surface of the support frame, the bottom of the folding frame is rotatably connected to the inside of the base, the top of the folding frame is rotatably connected to the bottom of the upper support platform, the bottom end of the first cylinder is rotatably connected to the inside of the base, the output end of the first cylinder is rotatably connected to the outer surface of the folding frame, the two ends of the rotating shaft are rotatably connected to the inside of the upper support platform, and the rotating shaft is linearly arranged along the upper surface of the upper support platform.

[0006] Preferably, the pushing mechanism includes a second cylinder, the outer surface of which is fixedly connected to the inside of the upper support platform, the second cylinder is symmetrically arranged on both sides of the upper support platform, the output end of the second cylinder is fixedly connected to a fixed plate, and the outer surface of the fixed plate is fixedly connected to a fixed connecting piece.

[0007] Preferably, the fixed connecting member is internally rotatably connected with a first rotating rod and a second rotating rod, the output ends of the first rotating rod and the second rotating rod are rotatably connected with a movable connecting member, the outer surface of the movable connecting member is provided with a first push plate, and the outer surface of the first push plate is provided with a second sliding groove.

[0008] Preferably, the outer surface of the movable connecting member is slidably connected to the inside of the second slide groove, the outer surface of the first rotating rod is fixedly connected to the first spring, the output end of the first spring is fixedly connected to the outer surface of the second rotating rod, and the first push plate is arranged above the upper support platform.

[0009] Preferably, the adjusting device includes a fixed seat, the bottom of which is fixedly connected to the side of the upper surface of the support frame, the interior of the fixed seat is fixedly connected to a third cylinder, the outer surface of the output shaft of the third cylinder is provided with a scale, and the output end of the third cylinder is fixedly connected to a second push plate.

[0010] Preferably, the inner surface of the protective shell is fixedly connected to the outer surface of the support frame, the outer surface of the transmission assembly is fitted with the inner surface of the protective shell, the outer surface of the opening and closing door is hinged to the outer surface of the protective shell, the outer surface of the observation window is fixedly connected to the outer surface of the protective shell, the cleaning mechanism is arranged inside the protective shell, and the buffer mechanism is arranged on the inner surfaces of the protective shell and the opening and closing door.

[0011] Preferably, the cleaning mechanism includes an air pump, the bottom of which is fixedly connected to the upper surface of the protective sleeve shell, the output end of the air pump is fixedly connected to a connecting pipe, the connecting pipe is arranged in the inner cavity of the protective sleeve shell, the outer surface of the connecting pipe is fixedly connected to an injection pipe, the output end of the injection pipe is opposite to the observation window, and a miscellaneous hole is opened at the bottom of the protective sleeve shell, and the miscellaneous hole is arranged directly below the injection pipe.

[0012] Preferably, the buffer mechanism includes an elastic plate, the outer surface of the elastic plate is fixedly connected to a foam pad, the end of the elastic plate away from the foam pad is fixedly connected to a second spring and a bent spring plate, the bent spring plates are symmetrically arranged on both sides of the second spring, the output end of the second spring is fixedly connected to the inner surfaces of the protective cover shell and the opening and closing door, and the outer surface of the bent spring plate is fixedly connected to the inner surfaces of the protective cover shell and the opening and closing door.

[0013] The present invention provides an electro-hydraulic servo pressure testing machine. It has the following beneficial effects:

[0014] 1. The electro-hydraulic servo pressure testing machine can realize mechanical loading through the loading device with the cooperation of the folding support frame, the first cylinder, the rotating shaft and the pushing mechanism. In the loading process, not only can the rotating shaft be used to make the movement of the workpiece to be tested easier, thereby improving the loading efficiency, but also the loading device can be ensured to have a long service life and not be easily deformed.

[0015] 2. This electro-hydraulic servo pressure testing machine, through the adjustment mechanism, after the loading device moves the workpiece to be tested onto the lower pressure plate, the two third cylinders cooperate to enable the second push plate to push the workpiece to be tested to the center position of the lower pressure plate, so that the test results in subsequent tests are more accurate and the movement of the workpiece during the test due to its biased position is avoided.

[0016] 3. The electro-hydraulic servo pressure testing machine can prevent the fragments of the test piece from splashing around and causing danger to the workers through the protective device. The foam pad can provide a certain buffer to reduce the impact of the fragments when they hit, and can also reduce the noise when the fragments hit. The elastic plate, the second spring and the bent spring plate can further weaken the impact force of the fragments, which can minimize the damage to the protective device caused by the fragments splashing. The cleaning mechanism can keep the observation window clean for easy observation during the test and facilitate the experiment.

[0017] Fourth, the electro-hydraulic servo pressure testing machine improves the degree of automation of the pressure testing machine through the coordination between the feeding device, the adjusting device, the driving motor, the worm gear, the worm and the protective device, which can further reduce the workload and labor intensity of the staff. It is suitable for pressure testing of larger test pieces and improves the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the lower pressure plate of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the feeding device of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the material pushing mechanism of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the regulating device of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the protection device of the present invention;

[0024] Figure 7 It is a schematic cross-sectional view of the protective device of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the buffer mechanism of the present invention.

[0026] In the figure: 1, base; 2, support frame; 3, oil cylinder; 4, column; 5, crossbeam; 6, feeding device; 61, base; 62, folding support frame; 63, first cylinder; 64, upper support platform; 65, rotating shaft; 66, pushing mechanism; 661, second cylinder; 662, fixed plate; 663, fixed connecting piece; 664, first rotating rod; 665, second rotating rod; 666, movable connecting piece; 667, first spring; 668, first pushing plate; 669, second slide; 7, adjusting device; 71, fixed seat; 72, third cylinder; 73, scale; 74 , second push plate; 8, protection device; 81, protection cover; 82, opening and closing door; 83, observation window; 84, cleaning mechanism; 841, air pump; 842, connecting pipe; 843, jet pipe; 844, miscellaneous hole; 85, buffer mechanism; 851, elastic plate; 852, foam pad; 853, second spring; 854, bending spring plate; 9, transmission assembly; 10, upper pressure plate; 11, lower pressure plate; 12, first slide groove; 13, workbench; 14, connecting plate; 15, driving motor; 16, worm; 17, worm wheel; 18, driving wheel; 19, driven wheel. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0028] Example 1

[0029] like Figure 1-Figure 2As shown, the present invention provides a technical solution: an electro-hydraulic servo pressure testing machine, comprising a base 1 and a support frame 2, the upper surface of the base 1 is fixedly connected with a column 4, the middle of the upper surface of the base 1 is fixedly connected with a cylinder 3, the top of the column 4 is fixedly connected with a crossbeam 5, the outer surface of the column 4 is provided with a transmission component 9, the bottom of the transmission component 9 is fixedly connected with an upper pressure plate 10, the inside of the support frame 2 is fixedly connected to the outer surface of the column 4, the outer surface of the support frame 2 is fixedly connected with a feeding device 6 and a protective device 8, the side of the upper surface of the support frame 2 is fixedly connected with an adjusting device 7, the upper surface of the support frame 2 is provided with a first slide groove 12, a lower pressure plate 11 is provided directly below the upper pressure plate 10, the bottom of the lower pressure plate 11 is fixedly connected with a workbench 13, and the outer surface of the workbench 13 is fixedly connected with a connecting rod 16. A connecting plate 14, the top of the inner surface of the connecting plate 14 is fixedly connected to a driving motor 15, a worm 16 is sleeved inside the connecting plate 14, a worm wheel 17 is fixedly connected to the output shaft of the driving motor 15, the outer surface of the worm wheel 17 is meshed with the outer surface of the worm 16, and both ends of the worm 16 are fixedly connected to a driving wheel 18, and a driven wheel 19 is rotatably connected to the side of the bottom of the workbench 13, and the outer surfaces of the driving wheel 18 and the driven wheel 19 are extruded and adapted to the inner surface of the first slide groove 12, the feeding device 6 includes a base 61, a folding support frame 62, a first cylinder 63, an upper support platform 64, a rotating shaft 65 and a pushing mechanism 66, the protective device 8 includes a protective cover shell 81, an opening and closing door 82, an observation window 83, a cleaning mechanism 84 and a buffer mechanism 85, and the adjusting device 7 is symmetrically arranged on the upper surface of the support frame 2.

[0030] When in use, the drive motor 15 is started to drive the worm wheel 17 to rotate, and the worm 16 rotates accordingly, so that the driving wheel 18 rotates, and cooperates with the driven wheel 19 to drive the workbench 13 and the lower pressure plate 11 to move to the outermost side of the support frame 2, and the test piece is placed on the upper support platform 64, and the first cylinder 63 is started to unfold the folding support frame 62, and the upper support platform 64 moves upward until it is flush with the lower pressure plate 11, and the pushing mechanism 66 is driven to push the test piece to the upper surface of the lower pressure plate 11, and then the adjusting device 7 is driven to make The workpiece to be tested is kept centered on the lower pressure plate 11 to facilitate more accurate test results. The drive motor 15 is started again to rotate in the opposite direction, so that the active wheel 18 and the driven wheel 19 drive the workbench 13 and the lower pressure plate 11 to move to just below the upper pressure plate 10. The opening and closing door 82 is closed so that the workpiece to be tested is in the inner cavity of the protective sleeve 81. The lower surface of the upper pressure plate 10 is contacted with the upper surface of the workpiece to be tested through the transmission assembly 9. The oil cylinder 3 is started so that the piston lifts the workbench 13 upward to complete the test.

[0031] Example 2

[0032] like Figure 3-Figure 5As shown, the outer surface of the base 61 is fixedly connected to the outer surface of the support frame 2, the bottom of the folding frame 62 is rotatably connected to the inside of the base 61, the top of the folding frame 62 is rotatably connected to the bottom of the upper support platform 64, the bottom end of the first cylinder 63 is rotatably connected to the inside of the base 61, the output end of the first cylinder 63 is rotatably connected to the outer surface of the folding frame 62, the two ends of the rotating shaft 65 are rotatably connected to the inside of the upper support platform 64, and the rotating shaft 65 is linearly arranged along the upper surface of the upper support platform 64.

[0033] The pushing mechanism 66 includes a second cylinder 661, the outer surface of which is fixedly connected to the inside of the upper support platform 64. The second cylinder 661 is symmetrically arranged on both sides of the upper support platform 64. The output end of the second cylinder 661 is fixedly connected to a fixed plate 662, and the outer surface of the fixed plate 662 is fixedly connected to a fixed connecting piece 663.

[0034] The fixed connecting member 663 is internally rotatably connected with the first rotating rod 664 and the second rotating rod 665, and the output ends of the first rotating rod 664 and the second rotating rod 665 are rotatably connected with the movable connecting member 666. The outer surface of the movable connecting member 666 is provided with a first push plate 668, and the outer surface of the first push plate 668 is provided with a second sliding groove 669.

[0035] The outer surface of the movable connecting member 666 is slidably connected to the inside of the second slide groove 669, the outer surface of the first rotating rod 664 is fixedly connected to the first spring 667, the output end of the first spring 667 is fixedly connected to the outer surface of the second rotating rod 665, and the first push plate 668 is arranged above the upper support platform 64.

[0036] The adjusting device 7 includes a fixed seat 71, the bottom of which is fixedly connected to the side of the upper surface of the support frame 2, a third cylinder 72 is fixedly connected inside the fixed seat 71, a scale 73 is provided on the outer surface of the output shaft of the third cylinder 72, and a second push plate 74 is fixedly connected to the output end of the third cylinder 72.

[0037] When in use, the folding support frame 62 is in a folded state through the loading device 6, so that the workpiece to be tested can be placed on the upper support platform 64. After the workpiece to be tested is placed, the first cylinder 63 is started to unfold the folding support frame 62, and the upper support platform 64 moves upward until it is flush with the lower pressure plate 11. The second cylinder 661 is started to extend it, and the fixed plate 662 moves accordingly. After the first push plate 668 is attached to the workpiece to be tested, the fixed plate 662 continues to move, and the fixed plate 662 approaches the first push plate 668, so that the first rotating rod 664 and the second rotating rod 66 The movable connecting member 666 is rotated and opened, and the movable connecting member 666 slides along the second sliding groove 669, and the first spring 667 is stretched. In the process of the first push plate 668 pushing the workpiece to be tested, the first rotating rod 664, the second rotating rod 665 and the first spring 667 cooperate to disperse the force applied to the first push plate 668, thereby preventing the first push plate 668 from being greatly deformed after working for a long time. In the process of the workpiece to be tested moving, the rotating shaft 65 is rotated by the friction force, and a reverse force is applied to the workpiece to be tested, making the movement of the workpiece to be tested easier, thereby improving the loading efficiency.

[0038] Through the adjusting device 7, after the pushing mechanism 66 pushes the workpiece to be tested to a suitable position on the upper surface of the lower pressure plate 11, the third cylinder 72 is started to extend it, and the two third cylinders 72 cooperate to make the second push plate 74 push the workpiece to be tested to the middle position of the lower pressure plate 11. By observing the scale 73, the workpiece to be tested is accurately placed in the center position of the lower pressure plate 11, so that the test results in subsequent tests are more accurate, and the movement of the workpiece to be tested during the test process due to its biased position is avoided.

[0039] Example 3

[0040] like Figure 6-Figure 8 As shown, the inner surface of the protective shell 81 is fixedly connected to the outer surface of the support frame 2, the outer surface of the transmission assembly 9 is fitted with the inner surface of the protective shell 81, the outer surface of the opening and closing door 82 is hinged to the outer surface of the protective shell 81, the outer surface of the observation window 83 is fixedly connected to the outer surface of the protective shell 81, the cleaning mechanism 84 is arranged inside the protective shell 81, and the buffer mechanism 85 is arranged on the inner surfaces of the protective shell 81 and the opening and closing door 82.

[0041] The cleaning mechanism 84 includes an air pump 841, the bottom of which is fixedly connected to the upper surface of the protective shell 81, the output end of the air pump 841 is fixedly connected to a connecting pipe 842, the connecting pipe 842 is arranged in the inner cavity of the protective shell 81, the outer surface of the connecting pipe 842 is fixedly connected to an injection pipe 843, the output end of the injection pipe 843 is opposite to the observation window 83, and the bottom of the protective shell 81 is provided with a debris outlet hole 844, which is arranged directly below the injection pipe 843.

[0042] The buffer mechanism 85 includes an elastic plate 851, the outer surface of which is fixedly connected to a foam pad 852, the end of the elastic plate 851 away from the foam pad 852 is fixedly connected to a second spring 853 and a bending spring plate 854, the bending spring plate 854 is symmetrically arranged on both sides of the second spring 853, the output end of the second spring 853 is fixedly connected to the inner surfaces of the protective cover shell 81 and the opening and closing door 82, and the outer surface of the bending spring plate 854 is fixedly connected to the inner surfaces of the protective cover shell 81 and the opening and closing door 82.

[0043] When in use, the test process of the test piece is carried out in the protective cover 81 through the protection device 8. During the test, the opening and closing door 82 is closed to prevent the fragments of the test piece from flying around and causing danger to the staff. The flying fragments hit the foam pad 852. The soft characteristics of the foam material can provide a certain buffer to reduce the impact of the fragments when hitting, and can also reduce the noise when the fragments hit. The elastic plate 851 is deformed by the force, the second spring 853 and the bent spring plate 854 are compressed, and the impact force of the fragments is further weakened. Due to the buffer mechanism 85 are arranged on three sides of the test piece except one side of the observation window 83, which can minimize the damage to the protection device 8 caused by the splashing of fragments, and can extend the service life of the protection device 8. After multiple tests, some dust will accumulate on the inner wall of the observation window 83, affecting the observation line of sight of the staff. Start the air pump 841 to make the high-pressure air flow pass through the connecting pipe 842 and spray out from the jet pipe 843 to blow off the dust on the inner wall of the observation window 83. The fallen dust is discharged from the outlet hole 844, so that the observation window 83 can be kept clean for observation during the test.

[0044] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. An electro-hydraulic servo pressure testing machine, comprising a base (1) and a support frame (2), characterized in that: The upper surface of the base (1) is fixedly connected to a column (4), the middle of the upper surface of the base (1) is fixedly connected to an oil cylinder (3), the top of the column (4) is fixedly connected to a crossbeam (5), the outer surface of the column (4) is provided with a transmission assembly (9), the bottom of the transmission assembly (9) is fixedly connected to an upper pressure plate (10), the inside of the support frame (2) is fixedly connected to the outer surface of the column (4), the outer surface of the support frame (2) is fixedly connected to a feeding device (6) and a protective device (8), the side of the upper surface of the support frame (2) is fixedly connected to an adjustment device (7), the upper surface of the support frame (2) is provided with a first slide groove (12), a lower pressure plate (11) is provided directly below the upper pressure plate (10), the bottom of the lower pressure plate (11) is fixedly connected to a workbench (13), the outer surface of the workbench (13) is fixedly connected to a connecting plate (14), the top of the inner surface of the connecting plate (14) is fixedly connected to the upper pressure plate (13), and the upper surface of the connecting plate (14) is fixedly connected to the upper pressure plate (13). A drive motor (15) is connected, a worm (16) is sleeved inside the connecting plate (14), a worm wheel (17) is fixedly connected to the output shaft of the drive motor (15), the outer surface of the worm wheel (17) is meshed with the outer surface of the worm wheel (16), both ends of the worm wheel (16) are fixedly connected to a driving wheel (18), and a driven wheel (19) is rotatably connected to the side of the bottom of the workbench (13), and the outer surfaces of the driving wheel (18) and the driven wheel (19) are The surface is extruded and adapted with the inner surface of the first slide groove (12), the feeding device (6) comprises a base (61), a folding support frame (62), a first cylinder (63), an upper support platform (64), a rotating shaft (65) and a pushing mechanism (66), the protection device (8) comprises a protection shell (81), an opening and closing door (82), an observation window (83), a cleaning mechanism (84) and a buffer mechanism (85), and the adjustment device (7) is symmetrically arranged on the upper surface of the support frame (2).

2. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The outer surface of the base (61) is fixedly connected to the outer surface of the support frame (2); the bottom of the folding frame (62) is rotatably connected to the inside of the base (61); the top of the folding frame (62) is rotatably connected to the bottom of the upper support platform (64); the bottom end of the first cylinder (63) is rotatably connected to the inside of the base (61); the output end of the first cylinder (63) is rotatably connected to the outer surface of the folding frame (62); the two ends of the rotating shaft (65) are rotatably connected to the inside of the upper support platform (64); and the rotating shaft (65) is linearly arranged along the upper surface of the upper support platform (64).

3. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The pushing mechanism (66) comprises a second cylinder (661), the outer surface of which is fixedly connected to the interior of the upper support platform (64), the second cylinder (661) is symmetrically arranged on both sides of the upper support platform (64), the output end of the second cylinder (661) is fixedly connected to a fixed plate (662), and the outer surface of the fixed plate (662) is fixedly connected to a fixed connecting piece (663).

4. The electro-hydraulic servo pressure testing machine according to claim 3, characterized in that: The fixed connecting member (663) is internally rotatably connected to a first rotating rod (664) and a second rotating rod (665), and the output ends of the first rotating rod (664) and the second rotating rod (665) are rotatably connected to a movable connecting member (666), and the outer surface of the movable connecting member (666) is provided with a first push plate (668), and the outer surface of the first push plate (668) is provided with a second sliding groove (669).

5. The electro-hydraulic servo pressure testing machine according to claim 4, characterized in that: The outer surface of the movable connecting member (666) is slidably connected to the inside of the second slide groove (669), the outer surface of the first rotating rod (664) is fixedly connected to the first spring (667), the output end of the first spring (667) is fixedly connected to the outer surface of the second rotating rod (665), and the first push plate (668) is arranged above the upper support platform (64).

6. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The adjusting device (7) comprises a fixed seat (71), the bottom of the fixed seat (71) is fixedly connected to the side of the upper surface of the support frame (2), the interior of the fixed seat (71) is fixedly connected to a third cylinder (72), the outer surface of the output shaft of the third cylinder (72) is provided with a scale (73), and the output end of the third cylinder (72) is fixedly connected to a second push plate (74).

7. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The inner surface of the protective shell (81) is fixedly connected to the outer surface of the support frame (2); the outer surface of the transmission assembly (9) is sleeved and matched with the inner surface of the protective shell (81); the outer surface of the opening and closing door (82) is hinged to the outer surface of the protective shell (81); the outer surface of the observation window (83) is fixedly connected to the outer surface of the protective shell (81); the cleaning mechanism (84) is arranged inside the protective shell (81); and the buffer mechanism (85) is arranged on the inner surfaces of the protective shell (81) and the opening and closing door (82).

8. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The cleaning mechanism (84) comprises an air pump (841), the bottom of which is fixedly connected to the upper surface of the protective shell (81), the output end of the air pump (841) is fixedly connected to a connecting pipe (842), the connecting pipe (842) is arranged in the inner cavity of the protective shell (81), the outer surface of the connecting pipe (842) is fixedly connected to an air jet pipe (843), the output end of the air jet pipe (843) is directly opposite to the observation window (83), and the bottom of the protective shell (81) is provided with a miscellaneous hole (844), and the miscellaneous hole (844) is arranged directly below the air jet pipe (843).

9. The electro-hydraulic servo pressure testing machine according to claim 1, characterized in that: The buffer mechanism (85) comprises an elastic plate (851), the outer surface of the elastic plate (851) is fixedly connected to a foam pad (852), one end of the elastic plate (851) away from the foam pad (852) is fixedly connected to a second spring (853) and a bending spring plate (854), the bending spring plate (854) is symmetrically arranged on both sides of the second spring (853), the output end of the second spring (853) is fixedly connected to the inner surface of the protective shell (81) and the opening and closing door (82), and the outer surface of the bending spring plate (854) is fixedly connected to the inner surface of the protective shell (81) and the opening and closing door (82).

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